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US 2023/0296162 A1Published application
Two-speed transmission for an electric drive system, and drive system including such a two-speed transmission
AssigneeHöHn GmbH
InventorBernd-Robert HÖHN
Life of this patent
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Abstract
A compact and fast-shifting two-speed transmission for an electric drive system, such as an electric vehicle, has two synchronized dog clutches. A sliding sleeve for engaging a first and second gear is actuatable using a single actuator. A substantially load-interruption-free shifting is realized via a friction engagement in the synchronization. A drive system having such a two-speed transmission is capable of achieving at least substantially load-interruption-free shifting.
Claims27
A transmission for an electric drive system for a vehicle, including:
- a housing
- an input shaft supported in the housing to be rotatable about a rotational axis
- an output shaft supported in the housing to be rotatable about the rotational axis
- a first planetary transmission and a second planetary transmission disposed adjacent to each other coaxially with the rotational axis and having different gear ratios with respect to each other, wherein the first planetary transmission and the second planetary transmission include a common planetary carrier supported in the housing to be rotatable about the rotational axis and connected to the output shaft the first planetary transmission includes a first ring gear supported in the housing to be rotatable around the rotational axis, and the second planetary transmission includes a second ring gear supported in the housing to be rotatable about the rotational axis,
- a locking device configured to selectively lock the first ring gear or the second ring gear to the housing so that, when the first ring gear is locked to the housing, a torque is transmissible from the input shaft to the output shaft via the first planetary transmission at a first gear ratio and, when the second ring gear is locked to the housing, a torque is transmissible from the input shaft to the output shaft via the second planetary transmission at a second gear ratio, wherein:
- the locking device includes:
- a sliding sleeve disposed in the housing to be non-rotatable relative to the housing while being axially movable along the rotational axis, the sliding sleeve having an internal gearing,
- a first synchronizer body rigidly connected to the first ring gear or formed integrally therewith, the first synchronizer body having an external gearing configured to be bringable into engagement with the internal gearing of the sliding sleeve by moving the sliding sleeve along the rotational axis into a first position,
- a second synchronizer body rigidly connected to the second ring gear or formed integrally therewith, the second synchronizer body having an external gearing configured to be bringable into engagement with the internal gearing of the sliding sleeve by moving the sliding sleeve along the rotational axis into a second position, and
- a displacing device having an actuator configured to displace the sliding sleeve along the rotational axis between the first position and the second position,
- the first synchronizer body has a first friction region on a side facing the second synchronizer body and the second synchronizer body has a second friction region on a side facing the first synchronizer body
- a first synchronizer ring has an external gearing configured to be bringable into engagement with the internal gearing of the sliding sleeve by actuating the actuator to move the sliding sleeve along the rotational axis,
- the first synchronizer ring has a third friction region configured to abut against the first friction region of the first synchronizer body
- a second synchronizer ring has an external gearing configured to be bringable into engagement with the internal gearing of the sliding sleeve by actuating the actuator to move the sliding sleeve along the rotational axis,
- the second synchronizer ring has a fourth friction region (44), which is configured to abut against the second friction region of the second synchronizer body
- the locking device is configured to actuate the actuator to move the sliding sleeve along the rotational axis using into a synchronization position, in which the internal gearing of the sliding sleeve is not in engagement with the external gearings of the first and second synchronizer bodies while simultaneously the internal gearing of the sliding sleeve is at least partially in engagement with the external gearings of both of the first and second synchronizer rings, and force is exerted by the sliding sleeve in the direction of the rotation axis onto one of the first or second synchronizer rings such that the corresponding first or second synchronizer body is brakeable by the friction engagement with said one of the first or second synchronizer rings and
- the fourth friction region of the second synchronizer ring and the first friction region of the second synchronizer body are dimensioned such that both have a torque capacity sufficient to transmit a torque to the output shaft in the synchronization position while the sliding sleeve moves from the first position into the second position.
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A transmission including
- a housing and
- a locking device wherein
- the locking device includes:
- a sliding sleeve movably supported in the housing along a movement axis, and having an internal gearing, a central axis of the sliding sleeve is being coaxial with the movement axis,
- a first synchronizer body disposed coaxially with the sliding sleeve the first synchronizer body having an external gearing configured to be bringable into engagement with the internal gearing of the sliding sleeve by moving the sliding sleeve along the movement axis, and having a first friction region
- a second synchronizer body disposed coaxially with the sliding sleeve
- the second synchronizer body having an external gearing configured to be bringable into engagement with the internal gearing by moving the sliding sleeve along the movement axis, and having a second friction region
- a first synchronizer ring having an external gearing configured to be bringable into engagement with the internal gearing (2-0) of the sliding sleeve by moving the sliding sleeve along the movement axis, and having a third friction region configured to abut against the first friction region of the first synchronizer body and
- a second synchronizer ring having an external gearing configured to be bringable into engagement with the internal gearing of the sliding sleeve by moving the sliding sleeve along the movement axis, and having a fourth friction region configured to abut against the second friction region of the second synchronizer body,
- wherein the locking device is configured such that:
- the sliding sleeve is configured to be bringable into a neutral position, in which the internal gearing of the sliding sleeve is not in engagement with the external gearing of the first synchronizer body and is not in engagement with the external gearing of the second synchronizer bodywhile simultaneously being in engagement with the external gearing of only one of the first or second synchronizer rings, and
- in a movement along the rotational axis, the sliding sleeve is configured to be bringable into a synchronization position, in which the internal gearing of the sliding sleeve is not in engagement with the external gearings of the first or second synchronizer bodies and simultaneously the internal gearing of the sliding sleeve is partially in engagement with the external gearing of one of the first or second synchronizer rings such that tooth-heads and tooth-troughs of the internal gearing of the sliding sleeve and of the external gearing of said one of the first or second synchronizer ring are rotated by an angle relative to each other to apply an axial force to said one of the first or second synchronizer rings such that the corresponding synchronizer body is synchonizable with said one of the first or second synchronizer rings via frictional engagement, while also being in engagement with the external gearing of the other one of the first or second synchronizer rings such that the tooth-heads and tooth-troughs of the internal gearing of the sliding sleeve and of the external gearing of the other one of the first or second synchronizer rings are not rotated relative to each other, so that no axial force is applied to the other one of the first or second synchronizer rings via this tooth engagement.
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Dependencies are inferred from the claim text.